LT8440

RECOMMENDED FOR NEW DESIGNS

Power Conditioner for APL Field Devices

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $2.85

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Part Details

650mW Power Limit for Intrinsic Safety Thermal Rating when Line Voltage ≤ 18.5V
35mA Current Limit if Line Voltage > 18.5V
55mA Current Limit for APL Class A Devices
Shunt Regulator for Mitigating Load Changes
Guaranteed 20mA Rectifier Current for Signal Integrity

Guaranteed to deliver full 500mW APL power to the load
6V to 36V Input Voltage
Integrated Current Sense Resistor
Polarity Insensitive Line Voltage Detectio
8-Lead SOIC Package with Exposed Pad

Part Models: 2
1ku List Price: Starting From $2.85

Documentation

Data Sheet 1

LT8440: Power Conditioner for APL Field Devices Data Sheet (Rev.0) 07/26/2024

User Guide 1

EVAL-LT8440-AZ User Guide: Power Conditioner for APL Field Devices (Rev.0) 07/26/2024

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT8440RS8E#PBF	8-Lead SOIC (Narrow 0.15 Inch w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8440RS8E#TRPBF	8-Lead SOIC (Narrow 0.15 Inch w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Evaluation Kits

Power Conditioner for APL Field Devices

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Product Details

The EVAL-LT8440-AZ evaluation circuit features the LT8440 used in a load power port of an intrinsically safe field device. It can regulate and limit the power drawn by the port according to the Ethernet Advanced Physical Layer (Ethernet-APL) standard. The EVAL-LT8440-AZ is designed with three LT8440s in series to meet the triple redundancy requirement of intrinsic safety Ex ia for class A field devices, but it can be configured to work with a lower LT8440 count. See the Redundancy of LT8440 section for more details.

The evaluation circuit is also equipped with filters and protection components to meet the Ethernet-APL and intrinsic safety standards, including IEC60079-11 and IEC60079-47 standards. Communication signal integrity is well preserved on this evaluation circuit, allowing seamless link up between 10BASE-T1L devices.

The EVAL-LT8440-AZ board is designed to operate from 9V to 17.5V input voltage. Across the input voltage range, the LT8440 draws current in parallel with the load up to the 500mW minimum guaranteed for Class A load power ports in compliance with Advanced Physical Layer (APL) standards. In case of load circuit failures, the evaluation board also limits input power below 650mW. The LT8440 shunts current even at no load to ensure at least 20mA input current during normal operation, which is required by APL specification for signal integrity.

Design files for this circuit board are available at Product Evaluation Boards and Kits | Design Center | Analog Devices.